What is the difference between polypropylene and polyester?
What is the difference between polypropylene and polyester?
pp color yarn and polyester yarn have significant differences in raw materials, performance, dyeing, use and cost:
Ingredients
pp color yarn: polypropylene as raw material, through polymerization, melt spinning made of polyolefin fiber. Polypropylene is rich in sources and the preparation process is mature, which makes the basic cost of polypropylene fiber has a certain advantage.
pp color yarn: its raw materials are terephthalic acid and ethylene glycol, after condensation reaction and then through melt spinning and other processes, belonging to polyester fiber, chemical structure is relatively complex, raw material synthesis steps more.
Performance characteristics
Strength: The polypropylene fiber has high strength, and the strength is basically not lost in the wet state; The strength of polyester color silk is also excellent, and even in some high-strength industrial silk application scenarios, the initial strength of polyester can be better than that of polypropylene, but its strength will decrease to a certain extent in the wet state, about 10%-20%.
Wear resistance: the flat wear resistance of polypropylene is second only to that of nylon, and the wear resistance is good in daily use scenarios; The wear resistance of polyester is also good, and it can maintain the stability of the fiber structure and maintain the integrity of the fabric in the condition of repeated friction and stretching.
Hygroscopic: polypropylene silk is almost non-hygroscopic, and the products have quick drying characteristics; Although the polyester color silk hygroscopic is also poor, but in contrast, it will absorb a small amount of water, moisture regain rate of about 0.4%, higher than the near zero hygroscopic polypropylene.
Heat resistance: the heat resistance of polypropylene is poor, and it begins to soften and deform at about 100℃ -120 ℃; The heat resistance of polyester is much better, the melting point is about 255℃ -260 ℃, and it can withstand higher temperature processing and use environment.
Antistatic property: polypropylene fiber is hydrophobic fiber, which is easy to generate static electricity during processing, and needs to rely on additives such as antistatic agents to improve; Polyester is also easy to carry static electricity, but because of its molecular structure has a certain polarity, its own anti-static ability is slightly stronger than polypropylene.
Dyeing property
Polypropylene yarn: polypropylene molecular structure is tight, polar base is small, hydrophobic, conventional dyeing method is difficult to color, most of the use of bulk dyeing, that is, the pigment or dye mixed with polypropylene raw materials spinning together.
Polyester color silk: The initial polyester dyeing is also more difficult, but with the development of disperse dyes and high temperature and high pressure dyeing process, polyester can now use disperse dyes to achieve a more uniform and rich dyeing effect under high temperature and high pressure environment.
use
pp color yarn: often used in the production of outdoor goods, such as quick-drying sportswear, swimsuits, relying on its very low moisture absorption to achieve rapid sweating effect; It is also used in industrial fields of ropes, fishing nets, geotextiles, to play its advantages of high strength and corrosion resistance.
Polyester color silk: Because of its better heat resistance and crisp, it is often used in the production of shirts, outerwear and other formal clothes. It is widely used in the industry for conveyor belts, curtain fabrics, filter fabrics, etc., thanks to its high strength and dimensional stability.
cost
pp color yarn: low raw material cost, relatively simple production process, the overall cost is often lower than polyester yarn, in some cost-sensitive large-scale, low value-added products are widely used.
Polyester color silk: raw material synthesis is complex, the production energy consumption is higher, so the product cost is usually higher than polypropylene color silk, but in the pursuit of high performance, special quality of the high-end market, still occupies an important position.
Ningbo Dazhong Chemical Fiber Industry Co., Ltd. long-term production and management: PP yarn, polypropylene filament, PP FDY yarn, polyester staple fiber, polypropylene full draft wire, polypropylene POY yarn, polyester POY yarn.